Reinforced carton



- June 12, 1951 R, @YER 2,556,915

REINFORCED CARTON Filed June 19, 1946 v 2 sheets-sheet 1 Patented June 12, vk1.951

UNITED STATES PATsNToFF-lcs REINFORCED CARTON Reynolds Guyer, St. Paul, Minn., assignor to Waldorf Paper Products Company, St. Paul, Minn., a corporation of Minnesota Application June 19, 1946, Serial No. 677,861

My invention relates to an improvement in reinforced cartons wherein it is desired to provide a carton possessing unusual resistance to compression.

Cartons of paperboard are often'used to contain products which are relatively heavy. When such cartons are stacked one upon the other, theyusually have ,several thicknesses of carton stock at each end and only one thickness of stock throughout most of the carton walls. The increase in thickness of the carton stock adds thickness not only to the walls, but also to the sealing flaps where such thickness is not required.

It is the object of the present invention to provide a carton of the glued end type having two opposed walls thereof reinforced by forming these walls of double thickness. As a result a considerable degree of stacking strength is added to the carton without adding thickness to the paper board of whi-ch the carton is formed. As a result an effective vseal may be provided and a minimum amount of carton stock is employed. A feature of the present invention resides in providing a tubular carton in which the ends of the carton blank are overlapped to form a wall of double thickness, and in which the Wall opposite the double thickness wall is provided with an auxiliary panel of paperboard adhered thereto. With such a construction two opposed walls of the carton are of double thickness while the remaining areas of the carton are of single thi-ckness. Y

A feature of the present invention lies in the provision of a carton having a pair of reinforced opposed walls and 'having sealing flaps issuing from the ends of these walls which may be readily sealed in superimposed relation to form a tight,

carton. The side walls of the carton are possessed of unusual stacking strength while at the same time the superimposed sealing flaps are of sufficiently light stock to provide an effective seal. These and other objects and novel features of my invention will be more clearly and fully set forth in the following specification and claim.

1 claim. (c1. 229-16) In the drawings forming a part of my specifi` cation Figure 1 is a perspective View of a carton showing my new construction.

Figure 2 is a transverse section through' the carton between theupper and lower endsthereof.

Figure 3 is a diagrammatic view of the blank in readiness for the sealing operation.

Figure 4 is a plan view of the reinforcing panel. used in conjunction with the main blank of the carton.

Figure 5 illustrates a carton blank similar to that shown in Figure 3 having a slightly differentV type of reinforcing panel used in conjunction therewith.

Figure 6 is a vertical section through the side walls, top and bottom of the carton shown in Figure 5.

The carton A, is in appearance, identical to a sealed end carton of a common type. The blank from which the carton A is formed is best illus-j trated in Figure 3 of the drawings. The carton A includes a side Wall panel Il), a rear wall panel II, a side wall panel I2, and a front wall panel I3 connected together along parallel fold lines I4, I5, and I6. to the panel I3 along the fold line I9 parallel to the previously described fold lines. The panel I'I in assembled form is designed to underlie the side wall panel I0 and to be secured firmly thereto.

A pair of fold lines 2i] and 2| intersect the fold lines Ill, I5, and I6 at substantially right angles thereto to form top and bottom edges for the side wall panels described. Top closing flaps 22 and 23 are connected to the panels IIJ and I2, respectively, along the fold line 2|] and are designed to lie in abutting coplanar relationship in sealed condition of the carton. Top flaps 24 and 25 are .connected to the panels II and I3, respectively, and are designed to lie in superimposed relation uponV the opposed flaps 22 and 23.

Bottom closing aps 26 and 2l are connected to the panels I9 and I2, respectively, along the fold line 2| and are designed to fold in abutting coplanar relationship. Bottom Closing flaps 2S and 3B are connected to the panels I l and I3, re-v spectively, along the fold line 2| to underlie the panels 26 and 2'| and to be secured thereto.

In order to reinforce the panel l2 opposite the double panel formed by adhering panels Il] and I'|, Iprovide an auxiliary panel 3| which is adhered to the inner surface of the panel I2. This auxiliary reinforcing panel 3| thus reinforces one side of the box while the panels I0 and 2A reinforce the other side of the box. As a result A reinforced panel I'I is connected' the carton is possessed of considerable stacking weight while at the same time the closing flaps are of suciently light board to form an effective seal.

I have found that by reinforcing the opposed side walls in the manner disclosed the carton can withstand a considerable amount of compression. Much the same effect can be obtained by increasing the thickness of stock of which the carton is formed. However, in the latter in' stance, a greater weight of carton stock is usually required than in the present structure`v and at the same time the effectiveness of the end seal of the carton is substantially reduced.

It may be found for example that in order to possess the necessary stacking strength a carton must be formed of 28 point stock, or stock .028 inch in thickness. It may also be found that by reinforcing the two end walls of the carton in the manner specified, a structure having the same compressive strength may be obtained by using 16 point board or board .016 inch in thickness. As a certain amount .of overlap is usually required to secure the carton walls in tubular formation, the reinforcing of the carton in the manner specied adds but little to the total amount of paper board used, as the double thickness areas are small relative to the entire area of the carton. Eiective results may therefore be obtained without greatly increasing the amount of paperboard used. Furthermore, the upper and lower ends of the carton seal eifectively, as they are formed of relatively light stock.

In Figures and 6 of the drawings I disclose a modified type of carton B which has many of the features of the carton A and has certain advantages thereover. The cartonB comprises a side wall panel 32, rear Wall panel 33, side wall panel 34, and front wall panel 35 connected along parallel fold lines 36, 31, and 3.9. A reinforcing wall panel 40 is connected to the panel 35 along a fold line 4l parallel to the previously described fold lines.

A pair of fold lines 42 and 43 intersect the previously described fold lines at right angles to form the upper and lower edges of the container in its sealed form. Closing flaps 44 and 45 are connected to the panels 32 and 34 respectively along the fold line 42. These closing flaps are designed to extend into coplanar relation in closed form of the carton. Closure flaps 46 and 41 connected along the fold line 42 to the panels 33 and 35, respectively, are designed to overlie the panels 44 and 45 and be secured thereto. An auxiliary panel 49 is connected along the fold line 42 to the upper extremity of the auxiliary panel 40 for an object which will be later described in detail.

Closing flaps 50 and 5l are foldably connected along the fold line 43 to the panels 32 and 34, respectively. Closing flaps 5D and 5I are designed to fold into coplanar relationship in sealed form of the carton. A panel 52 is foldably connected along the fold line 43 to the panel 33 and a similar closing flap 53 is connectedV along the same line to the opposed panel 35. An auxiliary closing ap 54 is connected to the lower edge of the auxiliary panel 40 along the fold line 43.

A reinforcing panel 5 5 is secured to the panel 34 and is fastened to the inner surface thereof.

An auxiliary panel 56 is foldably connectedto the panel 55 along fold line 51. An auxiliary ap 59 is secured to the panel 55 along the fold line 60. The fold line 51 substantially coincides with the fold line 42 when the panel 55 is in place, and similarly the fold line 60 substantially coincides with the fold line 43 in adhered position of the reinforcing panel.

The reinforcing flaps 56 and 59 are adhered to the inner surfaces of the closing flaps 45 and 5l. Similarly when the carton blank is folded the panel 40 is adhered to the inner surface of the panel 32 and the auxiliary flaps 49 and 54 are secured to the closing aps 44 and 50, respectively. Because of the double thickness of the side walls of the carton, and because of the double thickness of the auxiliary flaps connected to thereinfor'cing'panels, the top closure flaps 44 and 45 and the bottom closure flaps 59 and 5| are resistant to folding and tend to remain in coplanar relationship with the panels. from which they issue. This. resistance to folding Qf the doublerthiclsness pcrticns 0f thc closing liars. forms a rm support beneath the overlying o r underlying clcsurc flaps tc effect a good Seal.. In other words, inward pressure may be exerted against the outermost closing flaps without danger cf folding the reinforced clccing 11ans inwardly due to the double thickness formation thereof.

Y A better closing seal is o ften thus provided.

In accordance with thc patent statutesI I have described the principles of construction and operation of my reinforced carton, and while I have endeavored to setl forth the bestl embodiments Y thereof, I desire to have itunderstood thaty obvious' changes may be made within the scope of the following claim without departing from the spirit of my invention.

I claim:

A carton comprising a series of panels foldably connected together, the end panels of the series being arranged in overlapping relation and adhered together to form a double thickness panel, end iaps on said panels at atleast one end thereof l including end flaps on both of said overlapped panels, said end aps on said overlapped panels being adhered together, an auxiliary reinforcing panel underlying a second panel of said series, said reinforcing panel acting t0 reinforce said *Second Panel, and end flaps on said reinforced panel underlying and adhered to the end flaps issuing from said second panel, the remaining panels being of single thickness.

REYNOLDS GUYER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 254,679 Nash Mar. 7, 1882 888,026 Moore` May 19, 1908 1,747,967 Bell Feb. 18, 1930.

2,001,850 Patterson, Jr May 21, 1935 2,145,682 Bergstein Jan. 31, 193.9,

2,442,079 Dunning May 25, 1948.

FOREIGN PATENTS Number Country Date 29,612 Great Britain A. D. 1909 

